Question 1

If a molecule at the surface of a liquid has enough kinetic energy to escape the liquid phase and enter the gas phase,then which of the following terms is used to describe this phenomenon?

Accepted Answer

A)  Boiling point
B)  Condensation
C)  Vaporization
D)  Sublimation
E)  GasificationF) C) and E)
G) A) and B)

Question 2

Which of the following factors can contribute to the viscosity for a liquid?

Accepted Answer

A)  Temperature
B)  Hydrogen bonding
C)  Molecular entanglements
D)  London forces
E)  All of the answers are correct.F) A) and B)
G) A) and C)

Question 3

Liquid sodium can be used as a heat transfer fluid.Its vapor pressure is 40.0 torr at 633°C and 400.0 torr at 823°C.What is its heat of vaporization?

Accepted Answer

A)  43.4 kJ/mol
B)  52.5 kJ/mol
C)  70.6 kJ/mol
D)  1.00 × 102 kJ/mol
E)  3.64 kJ/molF) C) and D)
G) D) and E)

Question 4

Which one of the following substances crystallizes as a molecular solid?

Accepted Answer

A)  KI
B)  SiO2
C)  Sn
D)  CH3OH
E)  Al2(SO4) 3F) A) and B)
G) A) and C)

Question 5

For the solid forms of the following elements,which one is most likely to be of the molecular type?

Accepted Answer

A)  Cs
B)  C
C)  Pb
D)  S
E)  CrF) C) and D)
G) B) and D)

Question 6

Which has the highest surface tension at room temperature?

Accepted Answer

A)  CH4
B)  CF4
C)  CCl4
D)  CBr4
E)  CI4F) C) and D)
G) A) and D)

Question 7

The atomic planes in a graphite crystal are separated by 335 pm.At what angle would you find the first-order (n = 1) diffraction of 0.154-nm X rays from a graphite crystal?

Accepted Answer

A)  27.4°
B)  66.8°
C)  0.232°
D)  13.3°
E)  38.0°F) All of the above
G) None of the above

Question 8

Based on the phase diagram of a pure substance given below,what is the significance of the point labeled B?

Accepted Answer

A)  It is the normal melting point.
B)  It is the triple point.
C)  It is the critical point.
D)  It is the normal sublimation point.
E)  It is the normal boiling point.F) A) and B)
G) None of the above

Question 9

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? I.Na+,II.CH3COOH,III.C2H6,IV.CH3NH2

Accepted Answer

A)  I and II
B)  I and III
C)  II and III
D)  II and IV
E)  III and IVF) B) and C)
G) A) and E)

Question 10

Helium atoms do not combine to form He2 molecules,yet He atoms do attract one another weakly through

Accepted Answer

A)  dipole-dipole forces.
B)  ion-dipole forces.
C)  dispersion forces.
D)  dipole-induced dipole forces.
E)  hydrogen bonding.F) D) and E)
G) All of the above

Question 11

Molecular crystals are held together by the intermolecular forces of dispersion and dipole-dipole forces and by hydrogen bonding.

Accepted Answer

A) True 
 B)False

Question 12

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol,and its normal boiling point is 91°C.What is the vapor pressure of BBr3 at 20.°C? (R = 8.314 J/K • mol)

Accepted Answer

A)  11.5 torr
B)  659 torr
C)  255 torr
D)  66.2 torr
E)  167 torrF) C) and D)
G) None of the above

Question 13

In a sample of hydrogen iodide,__________________ are the most important intermolecular forces.

Accepted Answer

A)  dipole-dipole forces
B)  London dispersion forces
C)  hydrogen bonding
D)  covalent bonds
E)  polar covalent bondsF) A) and B)
G) B) and C)

Question 14

One of the crystalline forms of zinc oxide is a structure where the oxygen atoms are at the lattice points in a face-centered cubic lattice.How many atoms are in each unit cell?

Accepted Answer

A)  2
B)  4
C)  6
D)  8
E)  10F) A) and E)
G) A) and D)

Question 15

At a temperature of 27 K,neon condenses due to

Accepted Answer

A)  dipole-dipole forces.
B)  London dispersion forces.
C)  hydrogen bonding.
D)  covalent bonding.
E)  intramolecular forces.F) C) and D)
G) All of the above

Question 16

Identify the dominant (strongest)type of intermolecular force present in Cl2(l).

Accepted Answer

Question 17

a.State the essential requirements for hydrogen bonding to be important in a compound.
b.List four properties of water which are significantly influenced by the presence of hydrogen bonding.
a.The compound must contain hydrogen bonded to an atom which is small,electronegative,and has lone pairs of electrons.The atoms which meet these criteria are N,O,and F.

Accepted Answer

b.High specific heat capacity;...

Question 18

Identify the dominant (strongest)type of intermolecular force present in NH3(l).

Accepted Answer

Question 19

Krypton has a higher melting point than argon because of its

Accepted Answer

A)  hydrogen bonding.
B)  stronger dispersion forces.
C)  permanent dipole moment.
D)  ionic bonds.
E)  greater ionization energy.F) B) and E)
G) A) and E)

Question 20

Which one of the following substances does not exist in the indicated solid type?

Accepted Answer

A)  graphite-covalent crystals
B)  Na-metallic crystals
C)  SiO2-molecular crystals
D)  NaCl-ionic crystals
E)  diamond-covalent crystalsF) A) and E)
G) A) and C)

Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

Krypton has a higher melting point than argon because of its

Correct Answer
verified

Identify the dominant (strongest)type of intermolecular force present in Cl₂(l).

Correct Answer
verified

For the solid forms of the following elements,which one is most likely to be of the molecular type?

Correct Answer
verified

If a molecule at the surface of a liquid has enough kinetic energy to escape the liquid phase and enter the gas phase,then which of the following terms is used to describe this phenomenon?

Correct Answer
verified

Molecular crystals are held together by the intermolecular forces of dispersion and dipole-dipole forces and by hydrogen bonding.

Correct Answer
verified

Which one of the following substances does not exist in the indicated solid type?

Correct Answer
verified

In a sample of hydrogen iodide,__________________ are the most important intermolecular forces.

Correct Answer
verified

One of the crystalline forms of zinc oxide is a structure where the oxygen atoms are at the lattice points in a face-centered cubic lattice.How many atoms are in each unit cell?

Correct Answer
verified

Based on the phase diagram of a pure substance given below,what is the significance of the point labeled B?

Correct Answer
verified

At a temperature of 27 K,neon condenses due to

Correct Answer
verified

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol,and its normal boiling point is 91°C.What is the vapor pressure of BBr₃ at 20.°C? (R = 8.314 J/K • mol)

Correct Answer
verified

Which has the highest surface tension at room temperature?

Correct Answer
verified

Helium atoms do not combine to form He₂ molecules,yet He atoms do attract one another weakly through

Correct Answer
verified

Which of the following factors can contribute to the viscosity for a liquid?

Correct Answer
verified

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? I.Na⁺,II.CH₃COOH,III.C₂H₆,IV.CH₃NH₂

Correct Answer
verified

Liquid sodium can be used as a heat transfer fluid.Its vapor pressure is 40.0 torr at 633°C and 400.0 torr at 823°C.What is its heat of vaporization?

Correct Answer
verified

Which one of the following substances crystallizes as a molecular solid?

Correct Answer
verified

Identify the dominant (strongest)type of intermolecular force present in NH₃(l).

Correct Answer
verified

The atomic planes in a graphite crystal are separated by 335 pm.At what angle would you find the first-order (n = 1) diffraction of 0.154-nm X rays from a graphite crystal?

Correct Answer
verified

Correct Answer
verified
b.High specific heat capacity;...
View Answer

Exam 11: Intermolecular Forces and the Physical Properties of Liquids and Solids

Krypton has a higher melting point than argon because of its

Correct AnswerverifiedShow Answer

Identify the dominant (strongest)type of intermolecular force present in Cl2(l).

Correct AnswerverifiedShow Answer

For the solid forms of the following elements,which one is most likely to be of the molecular type?

Correct AnswerverifiedShow Answer

If a molecule at the surface of a liquid has enough kinetic energy to escape the liquid phase and enter the gas phase,then which of the following terms is used to describe this phenomenon?

Correct AnswerverifiedShow Answer

Molecular crystals are held together by the intermolecular forces of dispersion and dipole-dipole forces and by hydrogen bonding.

Correct AnswerverifiedShow Answer

Which one of the following substances does not exist in the indicated solid type?

Correct AnswerverifiedShow Answer

In a sample of hydrogen iodide,__________________ are the most important intermolecular forces.

Correct AnswerverifiedShow Answer

One of the crystalline forms of zinc oxide is a structure where the oxygen atoms are at the lattice points in a face-centered cubic lattice.How many atoms are in each unit cell?

Correct AnswerverifiedShow Answer

Based on the phase diagram of a pure substance given below,what is the significance of the point labeled B?

Correct AnswerverifiedShow Answer

At a temperature of 27 K,neon condenses due to

Correct AnswerverifiedShow Answer

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol,and its normal boiling point is 91°C.What is the vapor pressure of BBr3 at 20.°C? (R = 8.314 J/K • mol)

Correct AnswerverifiedShow Answer

Which has the highest surface tension at room temperature?

Correct AnswerverifiedShow Answer

Helium atoms do not combine to form He2 molecules,yet He atoms do attract one another weakly through

Correct AnswerverifiedShow Answer

Which of the following factors can contribute to the viscosity for a liquid?

Correct AnswerverifiedShow Answer

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? I.Na+,II.CH3COOH,III.C2H6,IV.CH3NH2

Correct AnswerverifiedShow Answer

Liquid sodium can be used as a heat transfer fluid.Its vapor pressure is 40.0 torr at 633°C and 400.0 torr at 823°C.What is its heat of vaporization?

Correct AnswerverifiedShow Answer

Which one of the following substances crystallizes as a molecular solid?

Correct AnswerverifiedShow Answer

Identify the dominant (strongest)type of intermolecular force present in NH3(l).

Correct AnswerverifiedShow Answer

The atomic planes in a graphite crystal are separated by 335 pm.At what angle would you find the first-order (n = 1) diffraction of 0.154-nm X rays from a graphite crystal?

Correct AnswerverifiedShow Answer

Correct Answerverifiedb.High specific heat capacity;...View AnswerShow Answer

Correct Answer
verified

Identify the dominant (strongest)type of intermolecular force present in Cl₂(l).

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
verified

The molar enthalpy of vaporization of boron tribromide is 30.5 kJ/mol,and its normal boiling point is 91°C.What is the vapor pressure of BBr₃ at 20.°C? (R = 8.314 J/K • mol)

Correct Answer
verified

Correct Answer
verified

Helium atoms do not combine to form He₂ molecules,yet He atoms do attract one another weakly through

Correct Answer
verified

Correct Answer
verified

Which of the responses includes all of the following that can form hydrogen bonds with water molecules? I.Na⁺,II.CH₃COOH,III.C₂H₆,IV.CH₃NH₂

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Identify the dominant (strongest)type of intermolecular force present in NH₃(l).

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
b.High specific heat capacity;...
View Answer